Illinois Rep. Jan Schakowsky called on her Republican challenger to stop blogging for Andrew Breitbart.

(CNN) - Conservative blogger Andrew Breitbart has hundreds of contributors to his website, and one of them is a Republican challenging Illinois Democratic Rep. Jan Schakowsky for her seat in Congress.

On Thursday, in the wake of the Shirley Sherrod firing controversy, Schakowsky called on her opponent, Joel Pollak, to "denounce Breitbart's intentional distortion of the truth and to end any further association with his website, BigGovernment.com."

Backlash against Breitbart has mounted since Monday, when he published a video of Sherrod, a USDA employee at the time, speaking to a crowd of NAACP members in Georgia. Liberals accuse Breitbart of deliberately editing the video to paint a portrait of a racist woman and NAACP members who applaud discrimination.

"Breitbart's publication of a video, which intended to turn the point of her speech into its exact opposite is the lowest form of political mudslinging," Schakowsky said in a statement.